Sand blasting machine, equipment, and the like



J."w. RAsMUssgN 2,324,425

EQUIPMENT, AND THE LIKE July 13, 1943..

SAND BLASTING MACHINE Filed` Jan 9 1945 Patented July 13, 1943 sANneLAs'rING MACHINE, EQUIPMENT, AND THE LIKE James William Rasmussen, LosAngeles, Calif.

Application January 9, 1943, `Serial No. 471,830

5y claims. H (ci. 's1-12) f My invention relates to sand blastingequipment and apparatus and more particularly to tanks land containerswhich are ot special construction and which are adapted for mixing thesand, or

suitable abrasive material, or steel shot with a suitable quantity-ofair and to deliver such mixture at a pressure and velocity which may berequired for blasting the surface of material requiring suchapplication.

l Accordingly, an object of myinvention is to provide a suitable tank orcontainer .which is adapted for holding` an'd for receiving therein aquantityl of Hsand or of other suitable material most applicable forblasting, said tank having a suitably arranged central passage such asatube, adapted forlconveying a mixture Vof air and sand therethrough,having in addition a suitable mixing chamber adapted for mixing andneutralizing the fluid pulsations caused by irregular pick-up ofmaterial through said central passage, also having a set of suitablyarranged pipes adapted for delivering and controlling the air passageinto said tank and said central passage, so that a uniformity of airpressures and air velocity may be maintained'y and controlled during theoperation ofthe apparatus.

- Another object of myv invention is to provide said tank with a centralpassage means to which a set of suitably arranged pipes are connected,each of which being provided with a series of air holes adapted f'ordrawing a quantity of sand and air therethrough and inaddition having asuitable controlmeans covering said pipes for controlling the quantityof air and sand mixture which may pass therethroughrand therebypreventing an over-load of sand during the operation of the apparatus.

Another object of my invention is to provide saidapparatus with suitablemeans adapted for loading sand into the tank, also for `automaticallyVloading said sand when it is usedout during the sand blasting operationof the plant.

AThe above and further objects and advantages of my device as willhereinafter more fully ap-.

pear, are attained by the construction described in the specificationand illustrated onl the drawing forming a part 0i my application.

Reference is had to the accompanying drawing in which similar referencecharacters denote the similar parts.

In the drawing Fig. 1 is the cross sectional view ofv the tank showingthe central passage, the

. mixing chamber, including the air inlet connecting pipe together withits gauges and valves, also showing means for loading the sand into saidtank.

Fig. 2 is the top view of the tankshowing the mixing chamberkand theloading means in position. Y l

Fig. 3 is the vertical sectional view of the mixing chamber slightlyenlarged, showing the baille plates in position,

Fig. 4 shows a perspective View of a tank having an open top anda sandfeed control means, same being shown in a modified form.

Fig. 5 is a fragmentary sectional View of the sand feed control taken onthe line 5-5 of the Fig.4. t

Fig. 6 is a fragmentary sectional view of the sand feed control shownAin another modified form.

'Fig. 7 is a fragmentary sectional view of the sand feed control takenon the line 1 1 of the Fig. 6. i

Fig. 8 shows diagrammatical view of the sand blasting plant, showing anautomatic control of the sand feed apparatus in to the tank. 1

Describing my invention more in detail, said invention comprises a tank,generally designated by numeral 2 having a set of suitable supportingmembers 4` which are 4att-ached thereto at the bottom section 6 andhaving its top section 8 provided withan inverted tankend member `I()whichis welded in place at the edges l2 and Y slightly lower than 4thetank edge, as shown.

Said tank 2, at said bottom section Gis provided with 'a Vsuitableopening It which is enclosed by means of a screw plug I6 so as to permitthe cleaning and draining of the tank contents and also for making anyrepairs or adjustments within the interiorv I8 of said tank 2, while inclose proximity thereabove and in the tank wall 20 a suitable opening 22is provided which is also enclosed by means of a suitable plug member 24so that any repairs, adjustments or assembly of the parts may be madetherein as in practice may be found required and advisable.

Interiorly within said tank 2 a suitable central passage or pipeconnection 26 is placed, which extends upwardly its entire length andwhich, at the bottom end 28 is connected to a central boss member 30while its upwardly extending end 32 protrudes through the top bossmember 34 which is Vdisposed within saidinverted tank end member I0, thepurpose and operation of which will be presently described.

Said central passage 26, at its internal side, is lined through itsentire length with a suitable rubber lining 36 in order to prevent thewear of its wall surface, while its bottom end 28 is provided with aplurality of cross pipes 3i?, each of which inter-connects said pipemember 26 and each of them is provided with a plurality of holes 40which may vary in size and in number as may be required.

Each of said pipes 33 has its outer end enclosed by means oi a suitablecap member 52 and each of the outer pipe surfaces are covered with asuitable flexible tube or a suitable rubber pipe 44, so that same may berolled or slipped on or off, and in this manner exposing any desirednumber or sizes of holes 4|) through which the sand 46 may be drawn inand causing same to flow and enter into said central passage 25.

For adjusting a position of said rubber pipes 42, either one of saidopenings I or 22 may be used and thereby covering or uncovering as manyholes as may be required so that the best volume Ior sand blasting andthe best results may be thus obtained.

Said boss member 39 is also provided with a suitable plug member 48which has a pipe member 50 leading through the entire length and thecenter of said central p-assage 26, as shownrin Figs. l and 3, of whichthe opposite end thereof connects with an air inlet pipe 52which'connects with a vertical air pipe 5d andthe air conduit pipe 56.

Said air inlet pipe 52 is provided with a suitable pipe connection 5Swhich connects said tank 2 at the bottom section 6 and having aregulating valve 6] connected thereto as shown,l While said verticalpipe 54 is provided with an air gage 62 for checking the air pressureentering the bottom of said tank 2, and in addition, said air conduitpipe 56 is provided with a pair of valves 64 and 66 which are forcontrolling said air pressure when entering the system of the apparatus.

In between said valves 64 and 65, said conduit pipe 56 is provided witha suitable connection 68 which connects the pipe member 70 and whichalso connects with the inverted tank end mem- Y ber le, having inaddition a suitable gauge 12 land a valve i4 which are for controllingthe air now while entering said tank 2 from the top and above the levelof the sand 46 when disposed within said tank 2and therebypermitting'the air 'to seep through said sand to the-bottom, thuspreventing its bridging around said ,pipesy 38.

It may also be noted that the internal air pressure supports and holdsin piace the cone member 'i6 which comprises a suitable apex T3 to whicha suitable chain member 88 is connected and which is wrapped around across shaft member 82, the ends of said shaft are disposed withinsuitable bearings S4 at the tank edges` i2 and having one of itsextended ends provided with a suitable lever or a handle 86 which isadapted for lowering andraising said cone member 16 into its place.

Said cone member 75 may be of any desired design as in practice may bemost desirable, however, in construction, it must be of sufficient sizein or er to permit a reasonable large amount or a quantity oi sand topass quickly through and into said tank 2 when loading same, and also tohold it tight in place and its opening 88 of which, its underside 63 isprovided with a collar 92 having a suitable recess for holding a gasketmember 84 in place and therefore permitting said cone member T6 to bearthere-against when held in place by means of said chain B9 and supportedin its position by means of said khandle 36 and also when the internalair pressure is applied thereto.

For preventing any foreign matter such as gravel or the like other thanthe sand or suitable material to pass into said tank 2, a suitable crossplate member 96 is placed as shown inFigs. 1 and 2, to which a set ofangle members 98 are attached and which are for the purpose to hold asuitable screen member in place.

The top boss member 34 whichj extends over the surface of saidV tank endmember I0 is pro- `vided with a suitable mixing chamber |82, comprisinga housing |54, see Fig. 3, which has its lower end |26 provided with asuitable boss |08 andhavng directly thereabove a recess l0 which isenclosed at the outer side by means of a plug member i i2, also withinsaid chamber |04 a pair Vof baiiie plates H4 are oppositely positionedas shown, which are for guiding the passing fluids and then for leadingsame to theexhaust end section Il@ and to the hose H8 which is connectedthereto. Y

In order'to hold vsaid pipe 26 in its proper position, said bossmember'34 is provided with a suitable tubing member |26 and which isheld in place in any mannermost adaptable in practice, having itsV end|22 extending upwardly for engaging the hole of theboss member |08.

Then to fasten' said mixing .chamber |02v in its place, said bossVmember |68 is provided with a pair of sidewardly extendinglugs |24,.seeFig. 2,

each or which is provided with a bolt |26 `and which are screwed intosuitably threaded bosses |28 at each side of said boss member 34, asshown in Fig. 1.. i

To prevent the air, which is` underV pressure within said tank 2 fromescaping around said pipe said tubing member |20 is provided with ya,

suitable collar VISB forming a ledge for holding in place a. suitablepacking |32, whereabove a collar member |34 is positioned having asuitable cross pin member |36 adapted for holding same 1n place, asshown in Fig, 3.

In this manner said mixing chamber` |02 is held firmly in place,Yallowing the mixturerof air and sand to pass thereto and blowing againstthe resilient cushion |40 which is disposed within ,said recess H6Vwhereupon said blast is-diverted in between said baille plates I4 thenowinginto the chamber |42Y and then leading tothe passage |4 of saidlexhaust end'section lland nally to the passage |46 of said'hose memberVI |28. ,Y

In order to hold saidy hose member ||8 in its proper position, saidmixing chamber [U2 is prot vided with a suitable recess |48 at theexhaust end section IE6, wherein a suitable cushion col,- lar |56 is'placed against which the end |52 of said hose H8 rests, while at theoutside, said end section IE5 is provided with a pair of bosses |54, seeFigs. 1 andV 2, which'are provided with suitably threadedY holes and forreceiving therein suitable bolts |56 and which are for holding in placethe flangemember |58 of the hose clamp# ing member |62 which grips theendV |52 offsaid hose member H8 when imposition.

It may be noted that'the air under -pressure may be permitted to flowinto said tank 2 through the pipe 56 and be regulated as tothe requiredpressure by` means of said valves 64 which willY cause said air to flowinto said pipe 'andemitting at the end |62, thus causing a vacuum to .beformed within said pipe 26. Said vacuum issupported therein by the flowof the air passing through the pipe '58` vand the volume thereofis-regulatedf-by mea-ns ofV the valve Y air and sand mixture may not atall times be uniform which is due and is lcaused -by an irregular ow. ofsaid sand-around and into said cross pipes 38, therefore said mixingchamber |02 overcomes the irregularity of the fluid flow through theapparatus by allowing the air flowing at high pressure through the pipe50 to expand at the cavities |64 and |68 andthereby equalizing the flowof fluids when passing through the passage i member |44 and into saidhose member H8.

In'order to hold said hose member ||8 in its proper position theinternal section of said clamping member |60 is provided with aplurality of circular. ridges |12, so that when clamped overithe hosesurface,- said ridges |12 will grip it=in place andV thereby willprevent same from slipping out of its position, also, to prevent lsaidhose I8 from breaking'at its clamping section when held by said clampingmember '|60, the outside surface of said hose is .provided with asuitable coiled spring support |14 -having one end secured to saidclamping member |60 and thus adding considerable resiliency to said hosemember when same isin use.

In the Fig. 4 said tank 2 is shown in its modified form, comprising arectangular shell |16 having an open top section |18 and having itsbottom section |80 tapered toward the center |82 which terminates with asuitable trough |84.

Said shell |16 is supported in its position by means of a set ofsuitable uprights |86 which hold said trough |84 at arequired height, ofwhich, the end section |88 is provided with a suitable hose member IIBincluding an air hose |90 for drawing the sand out of of said tank 2,while the ow of said sand is controlled by means of a suitablecontrolling pipe member |92 which lies parallel with said trough |84 andwhich is mounted within a bearing |94 having its end protruding throughthe end 96 to which the indicator member |98 is attached and whichindicates the position of said pipe |92 so that the position of theholes 200, see Fig. 5, may be maintained in order to draw the sandtherethrough when the apparatus is in its operation,

The Figs. 6 and 7, show the trough |84 in a modified form which comprisean adjustably mounted fluid now regulator 202 and which is positionedover said pipe |92 and directly above said holes or apertures 200, whichmay be slot or any other opening as in practice may be most desirable,the position of which is controlled by means of a lever 204 so that arequired amount of sand may pass therethrough, also, said pipe |92 isprovided with a suitable hose I8 connected thereto at one end while anair inlet pipe is connected at the opposite end as at 206 for providingan air inflow into said apparatus.

In the Fig. 8 is shown a diagrammatical front View of the entire sandblasting apparatus which is automatic in its operation and which isdisposed within a suitable room or an enclosure 2|0 having a floor or aplatform 2|2 upon which the workmen operate during the operation of saidapparatus.

In order to load said tank 2 automatically with a suitable quantity ofsand, the supports 4 are mounted upon a set of suitable resilientmembers 2|4 which are held within suitable housings 2|6. The handle 86which controls the opening and closing of the passage'88 in said tank 2is provided with an upright rod extension 2 I8 which leads upwardly andto a point above the platform 2|2, where it is connected to anindicating device 220 which has a marker for indicating the position ofsaid tank 2 and thereby indicating when Said tank is full or empty.

Whenever said indicator 220 shows that said tank 2 is emptyand said tankis lifted upwardly supported by said springs 2 |4 the'lever 222 causes acontact with a rod member 224 which close the electrical circuit`flowing through the line 226 and 228 including' the line 230 whichconnects with the electrical motor 232. l

`Saidmotor 232 operates a gear reduction device-234 including a pulley236 which is provided with a belt 238`for engaging the pulley 240 of theloading conveyor 242, and which in operation supplies the sand to thehopper 244 and the tank 2, while said conveyor 242 is supplied with saidsand' from the binmember 246 `which .receives the Sand from the upperfloor or platform2l2 when the apparatus is in operation. l V

While I have thus described my invention with great particularity itwill be clear that the same may be modied throughout a wide'range.

I accordingly do not propose to be limited to the exact'details ofconstruction hereinshown on the drawing and described in thespecification but reserve the rights in practice to make the necessarychanges and modifications therein, which may come within the scope ofthe appended claims.

I claim as my invention:

l. A sand blasting apparatus of the class described comprising a tank, acentral tubular passage means in said tank, a set of cross pipesconnecting the bottom section of said central passage means, a mixingchamber connecting the upper end of said central passage means anddisposed upon the top section of said tank, a high pressure air conduittube passing through said central passage means and terminating withinthe intake end of said mixing chamber, and an air conduit pipesconnecting said high pressure air conduit tube including said centralpassage means and said tank, for supporting the air ow therethrough andfor drawing and for forcing a quantity of sand through said mixingchamber.

2. In a sand blasting apparatus of the class described comprising a tankmeans, a tubular passage longitudinally mounted in said tank, a set ofcross pipes disposed at the bottom section of said tubular passage, aplurality of holes in each of Said cross pipes, a covering meansadjustably disposed over each of said cross pipes for controlling thepassage of sand through said holes, a high pressure air conduit pipepassing through said tubular passage of said tank for creating a vacuumtherein and in said set of cross pipes for drawing a quantity of sandtherethrough, a set of air conduit pipes connecting said tank means andsaid tubular passage, a fluid mixing chamber means connected to theupper end of said tubular passage for mixing the sand and air passingtherethrough from said tank means, substantially .as described.

3. In a sand blasting apparatus adapted for drawing and for forcing aquantity of sand therethrough, comprising in combination, a mixingchamber means connected to the outlet end of said sand blastingapparatus, a set of baille plate means in said mixing chamber means formixing and for diverting the flow of air and sand passing therethroughand for neutralizing the ununiform pulsations of the air and sandmixtures which pass out of said sand blasting apparatus, and an exhaustmeans in said mixing chamber means for directing the mixed fluidspassing out of said mixing chamber means.

4. In a sand blasting apparatus of the classdescribed a tank means, anend closure means enclosing each end of said tank means a centraltubular passage means longitudinally mounted in said tank and connectingeachof said end closure means, a set of cross pipe means connecting saidtubular passage means and disposed in close proximity to the bottomclosure means of Said tank, a plurality of holes in each of said crosspipe means, means covering each f said cross pipe means for controllingthe fluid flow through said holes, a pair of hand hole means in Saidtank for adjusting the position of said last mentioned means over eachof said cross pipe means, a sand loading passage means in the upperclosure means of said tank, a cone member means disposed in said sandloading passage means, controlling means connected to said tank meansfor controlling the position of said cone member means Within said sandloading passage means, a screen means disposed over said sand loadingpassage means and connected to the upper edge of said tank forcontrolling the quality of sand passing therethrough, a high pressuretube in said central tubular passage for drawing said sand through saidcross pipe means, a mixing chamber means connected to the upper end ofsaid central tubular passage means for mixing the air and sand passingvtherethrough, and a set of air conduit pipes connecting said highpressure tube andV said central tubular passage including said tank forproviding uidal velocity for said sand blasting apparatus.

5. In a sand blasting apparatus of the class described comprising atank, a central passage mounted in said tank and connecting both endsthereof, a set of cross pipes disposed Within said tank and at thebottom section of said central passage, a plurality of holes in said setof cross pipes, an adjustable covering means slidably disposed over eachof said cross pipes for controlling the quantity of sand passing fromsaid tank and into said central passage, a high pressure airpipe in saidcentral passage for drawing a quantity of sand through said centralpassage, a set of air conduit pipes connected to said tank and'saidcentral passage, a set of valves connecting said air conduit pipes forregulating the air ow through said ,sand blasting apparatus,substantially as described. f

JAMES WILLIAM RAsMUssEN.

